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Resource utilization method and device for ammonium fluoride waste brine

A waste brine and ammonium fluoride technology, applied in chemical instruments and methods, metallurgical wastewater treatment, calcium/strontium/barium fluoride, etc., can solve the problems of enrichment of impurities and no export of impurities

Pending Publication Date: 2021-04-16
JIANGSU JIUWU HITECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of the above-mentioned method, impurities are enriched because there is no outlet for the impurities.

Method used

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  • Resource utilization method and device for ammonium fluoride waste brine
  • Resource utilization method and device for ammonium fluoride waste brine

Examples

Experimental program
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Effect test

Embodiment 1

[0048]Fluorinated abiotic water was filtered after 5 μm security filter, and the nanofiltration membrane was used to intercept the molecular weight 200Da, and the operating pressure was 1.5 MPa, concentrated by 8 times, and the stable flux reached after operation 2h. 20 l / m2· H, you can remove SO42-, CA2+Mg2+Equisical and other multivalent impurity ions, obtained nanofiltration membrane osmotic sulfate 0.1 g / l, COD201Mg / L, ammonia nitrogen 25 g / L, ammonium fluoride 49g / L; nanofiltration permeation Add CA (OH)261g / L, after the reactor is fully reacted, f-Change to CAF2The calcium fluoride tapers were washed with pure water, and the calcium fluoride products were dried; nanofiltration membrane concentrates were added to CA (OH)261g / L, after the adequate reaction pH reaches 12, join (NH4)2CO35.2g / L, after the reactor is fully reacted, make CA2+Change to Caco3Entering the stripper deamper, obtaining ammonia water, stripping residual liquid re-enters the ultrafiltration m...

Embodiment 2

[0050]Fluorinated abiotic water was filtered through a 5 μm security filter into the nanofiltration membrane separation, and the nanofiltration membrane of 150 DA was used, and the operating pressure was 1.5 MPa, concentrated by 8 times, and the stable flux reached after operation 2h. 18L / m2· H, you can remove SO42-, CA2+Mg2+Equisical impurity ions, obtained nanofiltration membrane osmotic sulfate 0.07 g / l, COD165 mg / L, ammonia nitrogen 25 g / L, ammonium fluoride 50 g / L; nanofiltration membrane permeation Add CA (OH)261.6g / L, after the reactor is fully reacted, f-Change to CAF2The calcium fluoride tapers were washed with pure water, and the calcium fluoride products were dried; nanofiltration membrane concentrates were added to CA (OH)262g / L, after the adequate reaction pH reaches 12, join (NH4)2CO35.28g / L, after the reactor is fully reacted, make CA2+Change to Caco3Entering the stripper deammine, obtaining ammonia water, the stripping residue re-enters the ultrafiltr...

Embodiment 3

[0052]Fluorinated abiotic water was filtered through a 5 μm security filter, and the nanofiltration membrane was separated. It used a nanofiltration membrane of 300 Da, which was 1.5 MPa, and 10 times concentrated. After operation 2h, the stable flux is 21L / m.2· H, you can remove SO42-, CA2+Mg2+Equisical and other multivalent impurity ions, obtained by nanofiltration membrane osmotic sulfate 0.14 g / l, COD205 mg / L, ammonia nitrogen 27 g / L, ammonium fluoride 50 g / L; nanofiltration permeation Add CA (OH)261.6g / L, after the reactor is fully reacted, f-Change to CAF2The calcium fluoride tapers were washed with pure water, and the calcium fluoride products were dried; nanofiltration membrane concentrates were added to CA (OH)261g / L, after the adequate reaction pH reaches 12, join (NH4)2CO35.2g / L, after the reactor is fully reacted, make CA2+Change to Caco3Entering the stripper deammine, obtaining ammonia water, the stripping residue re-enters the ultrafiltration membrane f...

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Abstract

The invention relates to a resource utilization method and device for ammonium fluoride waste brine, in particular to a membrane method recycling method and device for ammonium fluoride alkaline waste brine applied to the tantalum-niobium industry, which belongs to the technical field of the chemical industry. The method comprises the following steps of 1, removing multivalent ion impurities from the ammonium fluoride waste brine, and filtering by using a separation membrane to obtain purified brine, wherein the brine contains organic pollutants and sulfate, 2, adding a precipitant into the purified brine for fluorine resource recovery to obtain a high-purity calcium fluoride product, 3, carrying out negative pressure steam stripping on the membrane concentrated solution to recover an ammonium resource so as to obtain high-purity ammonia water, 4, carrying out RO concentration on the steam stripping residual liquid to obtain high-quality reuse water, and 5, carrying out MVR evaporative crystallization treatment on the concentrated solution to obtain solid salt. According to the resource utilization method and device for the ammonium fluoride strong brine, the problem that alkaline ammonium fluoride waste brine in the tantalum-niobium industry is difficult to treat effectively can be effectively solved.

Description

Technical field[0001]The present invention relates to a resource utilization method and apparatus for ammonium fluoride ablation saline, and more particularly to the method and apparatus for use in wet smelting produced by wet smelting in the tantalum industry, and is a chemical industry technology. field.Background technique[0002]A large amount of ammonium alkaline waste salt water will produce a large amount of ammonium fluoride, a large component of ammonium fluoride, free ammonia and a small amount of ammonium sulfate, pH 9 to 11, fluoride ion content 20 to 30 g / L, sulfate ion content 0.2 ~ 2g / L, ammonia nitrogen content 20 ~ 50 g / L, is a high fluorine high-amnyl nitrogen wastewater.[0003]At present, conventional treatment is to use lime to form fluoride ions in wastewater, form fluoride and calcium sulfate dispensing residue, and ammonia nitrogen in wastewater use blowr-free formation of ammonium sulfate. The entire process has high cost, covers an area, and does not comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/22C01C1/02C02F101/14C02F101/16C02F103/16
Inventor 白祖国王超许昆刘浩彭文博陈道康陈瑞春恽建军王磊张荟钦张泉范克银党建兵
Owner JIANGSU JIUWU HITECH
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